Planer-knife grinder



(No Mode l.)

G. H. MILLS.

PLANEB KNIFE GRINDER.

No.- 330,797. Patented N07. 17, 1885.

NITED STATES PATENT FFICE.

GEORGE H. MILLS, OF CONCORD, NEW HAMPSHIRE, ASSIGNOR TO HENRY F. CAMPBELL, OF BOSTON, MASSACHUSETTS.

PLANER-KNIFE GRINDER.

SPECIFICATION forming part of Letters Patent No. 330,797, dated November 17, 1885.

Application tiled March 24, 1885. Serial No. 159,904. (No model.)

To all whom it may concern:

Be it known that I, GEORGE H. MILLS, a citizen of the United States, residing at 0oncord, in the county of Merrimac and State of New Hampshire, have invented certain new and useful Improvements in Planer-Knife Grinders, of which the following is a specification.

My improved machine applies more espe cially to the grinding or sharpening of planerknives; but it is also adapted to almost anything requiring an even or straight beveled edge.

The novelty in this invention is principally in the means employed for feeding the article being ground nearer to the grindstone or emery-wheel; but this feature also extends to the manner of hinging the cutter-rest or knife-carriage to the iron bed-plate by means of arod, upon which said carriage is allowed the necessary reciprocal movement, and to the manner in which the bolts for clamping the knives to said carriage are adj ustably secured thereon.

In the accompanying drawings,forming part of this specification, similar letters of reference indicate corresponding parts in both the views, of which Figure 1 is a plan view, and Fig. 2 a vertical elevation at Y Y, Fig. 1.

The bed-plate A is provided upon its top side, and near either end thereof, with ears A, which are bored to receive the horizontal rod B, said rod being secured therein by the set-screws b. A carriage consisting of the knife-rest C, sup

ported by the arms 0 C is mounted by the arms 0 upon the rod B, which serves both as a hinge whereby the knife or cutter may be either brought in contact with a grindstone or emery-wheel, or swung .back and away from the same, and as a slideway by which' said carriage is guided while moving to and fro upon the bed-plate A.

In order that the knife rest or carriage C may pass in front of a grindstone at a given angle or elevation without being subject to the irregular or careless pressure of the operator, it becomes necessary to provide another slide-way upon which the bulk of the weight of the sliding carriage will be sus-. tained. For this purpose the center arm, 0,

preferably made as shown in Fig. 2, is formed upon or secured to the lower part of the knife-rest, its outer end being adapted to carry a suitable screw, D, threaded thereto, its lower end resting upon the piece D, which composes a slide-rest. This slide-rest is adapted to bear upon a raised surface, a, formed upon the top of the bed-plate A, on the opposite side to that upon which the ears A are shown. This surface a need be but an inch (more or less) in width,and no longer than the average planer-knife; but it must runparallel with the rod B and be planed level. That side of the knife-rest Cto which a planerknife, 0, may be fastened is planed to an even surface, and aT-- groove is formed therein, as shown in section, Fig. 2, running longitudinally its entire length, into which suitable bolts,E, are placed. By this construction the said bolts may be shifted as required, and thereby accommodate themselves to the ordinaryslots formed in the planer-knives, and after adjusting said bolts a knife, 0, is slipped over them and securely clamped to said rest C by means of the nuts e.

The are X (shown at the right of Fig. 2)

represents the face-line of a g'rindstone, and 7 by turning the screw D the whole carriage, to which the knife is bolted, may be adjusted so as to grind off whatever is required to sharpen a knife and bring it down to an even edge.

The principal advantages this machine possesses over machines previously devised for this purpose, are its simplicity and certain features of economy in construction, there being no part which can be dispensed with, and but four parts requiring finishviz., the

holes in the cars A, the slideway a, the rod B, I

and the knife-rest C.

When adjusting or removing a knife from the rest 0, said rest may be turned over, as seen by dotted lines in Fig. 2, by means of the rod B, to which it is hinged.

As a sure means for preventing the possible displacement of a knife while being operated upon, the right-angled ears 0 are formed on the lower part of the rest C, and provided with set-screws F, which, if the bolts E should" accidentally loosen, would still keep the knife up where it belonged.

lower face, adapted to receive the heads of bolts for clamping a knife thereon, and arms projecting from its lower edge, near either end thereof, and a rod upon which the outer ends of said arms are mounted, and rendered capable of a reciprocal and rotative motion by the hand of an operator, with a suitable bed-plate having elevated bearings in which said rod is mounted, and mechanism, substantially as described, for adjusting the height of 20 said knife-rest relative to the axis of a grindstone, consisting of a curvilinear arm projecting from thelower edge of said knife-rest, about midway from either end thereof, toward a grindstone, and carrying a screw resting upon a suitable slide-rest adapted to move upon a finished raised surface provided for v the purpose upon said bed-plate, whereby said knife-rest may be supported at an angle of about forty-five degrees, as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE H. MILLS. Witnesses:

J. B. THURSTON, NATHANIEL E. MARTIN. 

